Table 5.

Logistic regression analysis results for the severity of side effects.

	Severity of side effects †
Variable	Mild aOR (95% CI)	Moderate aOR (95% CI)	Severe aOR (95% CI)
Gender
Female (ref)
Male	1.93 (1.40–2.66)***	1.97 (1.37–2.84)***	2.76 (1.71–4.45)***
Age (years)
18–29 (ref)
30–39	3.52 (1.61–7.68)***	1.90 (0.74–4.84)	2.99 (0.86–10.3)
40–49	2.44 (1.31–4.57)**	2.19 (1.05–4.59)*	3.10 (1.10–8.72)*
50–59	2.63 (1.41–4.92)**	2.34 (1.12–4.88)*	2.61 (0.93–7.36)
≥60	1.94 (1.08–3.48)*	2.19 (1.09–4.38)*	1.83 (0.67–4.97)
Marital status
Unmarried (ref)
Married	0.90 (0.62–1.32)	0.76 (0.49–1.18)	0.80 (0.46–1.39)
Educational level
High school or below (ref)
University degree	0.81 (0.55–1.20)	0.83 (0.53–1.30)	1.03 (0.56–1.87)
Postgraduate degree	0.95 (0.69–1.30)	1.20 (0.83–1.73)	1.42 (0.87–2.31)
Employment status
Government sector employee (ref)
Private sector employee	1.58 (0.99–2.51)	1.44 (0.86–2.40)	1.64 (0.87–3.09)
Student	1.70 (1.01–2.85)*	1.35 (0.75–2.43)	1.39 (0.67–2.89)
Retired	1.66 (0.78–3.55)	2.64 (1.11–6.27)*	2.21 (0.76–6.37)
Unemployed	2.03 (1.23–4.86)*	1.04 (0.48–2.25)	1.10 (0.37–3.22)
Nationality
Non-Saudi (ref)
Saudi	2.44 (1.23–4.86)**	2.65 (1.27–2.71)**	3.64 (1.58–8.38)**
Smoker
No (ref)
Yes	1.34 (0.98–1.82)	1.86 (1.27–2.71)***	1.64 (0.98–2.73)
Chronic illness
No (ref)
Yes	0.76 (0.56–1.05)	0.68 (0.47–0.98)*	0.48 (0.30–0.75)**
Number of doses received
One (ref)
Two	0.72 (0.53–0.98)*	0.83 (0.58–1.18)	0.87 (0.55–1.36)
Infected with COVID-19 before vaccination
No (ref)
Yes	1.08 (0.72–1.61)	0.83 (0.54–1.29)	0.87 (0.49–1.53)
Anxiety
No (ref)
Yes	0.83 (0.63–1.09)	0.76 (0.55–1.05)	0.71 (0.47–1.08)

^*** p <0.01,

^** p <0.05,

^*p <0.1; aOR, adjusted odd ratios, CI, confidence interval.

^†No side effects is the reference category in the multinomial logistic regression model.